王家岗油田W块沙一段薄储层岩性识别方法和流体识别模式

Lithology Identification Method and Fluid Recognition Pattern of Thin Reservoir in the First Member of Shahejie Formation of Block W in Wangjiagang Oilfield

王家岗油田W块古近系沙河街组一段(Es1)油藏是增储上产的重要阵地。该储层具有单层厚度薄、岩性复杂、非均质性较强等特点,给准确识别流体性质带来很大困难,影响了区块开发方案的调整部署。针对工区Es1储层特点,主要进行了3项技术攻关:一是利用第一性资料,建立不同岩性的划分模式;二是利用薄层电阻率高分辨率反演方法,对电阻率进行薄层校正,使电阻率最大限度地反映地层的真实特征;三是在细分岩性的基础上,用正态分布法及交会图技术,建立储层流体评价模式,识别储层流体性质。应用上述方法对工区53口完钻井的测井资料进行精细评价,取得了良好的应用效果。

Reservoirs in Es1 of Block W in Wangjiagang Oilfield were the main area for increasing reserves and enhancing oil production.The reservoirs were characterized by thin single zone,complex lithology and higher heterogeneity,which caused much difficulty for identifying fluid property correctly,affected the adjustment and deployment of exploiting plan in the block.In allusion to the characteristics of Es1 in the work area,3 technical researches and developments were carried out,which included that:①the first data were used to establish modes for identifying different lithologies;②the method of high resolution seismic inversion of thin bed and high resistivity was used to correct thin bed with high resistivity,thus the actual characters of formation could reflected by resistivity;③on the basis of fine lithologic identification,normal distribution method and cross plot technique were deployed to establish fluid evaluating pattern for identifying fluid property.The methods described above are applied for fine evaluation of logging data of 53 drilled wells in the work area,and good results are obtained.